通过后缀获取文件类型

  getFileType(fileName) {
    let suffix = ''; // 后缀获取
    let result = ''; // 获取类型结果
    if (fileName) {
      const flieArr = fileName.split('.'); // 根据.分割数组
      suffix = flieArr[flieArr.length - 1]; // 取最后一个
    }
    if (!suffix) return false; // fileName无后缀返回false
    suffix = suffix.toLocaleLowerCase(); // 将后缀所有字母改为小写方便操作
    // 匹配图片
    const imgList = ['png', 'jpg', 'jpeg', 'bmp', 'gif']; // 图片格式
    result = imgList.find(item => item === suffix);
    if (result) return 'image';
    // 匹配txt
    const txtList = ['txt'];
    result = txtList.find(item => item === suffix);
    if (result) return 'txt';
    // 匹配excel
    const excelList = ['xls', 'xlsx'];
    result = excelList.find(item => item === suffix);
    if (result) return 'excel';
    // 匹配word
    const wordList = ['doc', 'docx'];
    result = wordList.find(item => item === suffix);
    if (result) return 'word';
    // 匹配pdf
    const pdfList = ['pdf'];
    result = pdfList.find(item => item === suffix);
    if (result) return 'pdf';
    // 匹配ppt
    const pptList = ['ppt', 'pptx'];
    result = pptList.find(item => item === suffix);
    if (result) return 'ppt';
    // 匹配zip
    const zipList = ['rar', 'zip', '7z'];
    result = zipList.find(item => item === suffix);
    if (result) return 'zip';
    // 匹配视频
    const videoList = ['mp4', 'm2v', 'mkv', 'rmvb', 'wmv', 'avi', 'flv', 'mov', 'm4v'];
    result = videoList.find(item => item === suffix);
    if (result) return 'video';
    // 匹配音频
    const radioList = ['mp3', 'wav', 'wmv'];
    result = radioList.find(item => item === suffix);
    if (result) return 'radio';
    // 其他文件类型
    return 'other';
  },